- They met in a training room before Kyuhyun even debuted : Yesung asked if Kyuhyun was a new trainee and told him to show his singing. He's probably the first SJ member Kyuhyun has talked to.
- Yesung was Kyuhyun's first roommate when he joined the dorm. They shared a room for 1-2 months when Kyuhyun didn't have his own bed (he slept on Yesung's floor) until Kyuhyun decided to switch rooms because Yesung would keep touching his philtrum.
- Yesung's first impression of Kyuhyun was "a cold guy", and Kyuhyun's first impression of Yesung was "our first night".
- Kyuhyun kept calling Yesung to congratulate him for the first day of his radio show "Miracle For You" even though the connection was really bad (060919).
- Kyuhyun was the first Super Junior member to guest in Yesung's "Miracle For You". He went a total of 19 times, from September 2006 to April 2007, and Yesung even considered him a regular guest.
- Kyuhyun thought Yesung was scary at first, but he changed his mind after getting to know him better and realized that Yesung was a "warm, kind-hearted, good person".
- Once, when Kyuhyun was eating ice-cream and wouldn't share it, Yesung got angry and kicked the ice-cream out of Kyuhyun's hands.
- When Kyuhyun was still unconscious after his car accident in 2007, Yesung recorded a message during "Miracle For You" saying he wouldn't get angry if Kyuhyun makes fun of him in the future, wishing for him to get better soon and come back on stage with the other members.
- They have two duets together: "Your Eyes" (4th SJ album "Bonamana", 2010) and "At The Time" (Yesung's album "Spring Falling", 2017).
- "Your Eyes" was the first duet that featured in a Super Junior album, and for that reason is Kyuhyun's favorite song from this album. They sang it live in KRY's "Special Winter Concert", and another time during Yesung's solo concert "THE AGIT: Sweet Coffee" when Kyuhyun surprised everyone (even Yesung himself) by appearing on stage.
- "At The Time" is one of Yesung's self composed songs: he wanted Kyuhyun to sing in his album just before Kyuhyun's enlistment because he felt sad at the thought of not being able to sing with him for two years.
- Kyuhyun is the one who changed the lyrics for Yesung's birthday song (The Muzit).
- KRY's cover of "Gray Paper" (SS5), Yesung's solo, was Kyuhyun's idea.
- Kyuhyun appears with Donghae in Yesung's "Pink Magic" MV.
- During his military service, Yesung wrote songs thinking about Kyuhyun at night.
- Kyuhyun kept playfully calling Yesung's solo album "Spring Pancake" (the real title is "Spring Falling").
- The words "Here I am" (one of Yesung's solo songs) appear in Kyuhyun's "Aewol-ri" MV.
Relationship/Dynamic
Other facts
- Yesung is one of Kyuhyun's favorite hyungs when it comes to teasing and joking around. Kyuhyun even said he was the happiest when he makes fun of him and Donghae.
- Yesung had said many times that he thinks Kyuhyun's teasing him is cute.
- According to Yesung, Kyuhyun is the first to be by his side when Yesung is tired and would come to cheer him up when he's in a bad mood.
- Kyuhyun was the first one to call Yesung at midnight for his birthday (100824).
- Kyuhyun used to grab Yesung's hands when it would go into his mouth to help him stop biting his nails.
- Yesung said he never gets bored when he's with Kyuhyun.
- They love to compare hands, especially Kyuhyun who always talks about how small Yesung's hands are.
- When asked if they're rivals because of their constant banters, Kyuhyun replied that they act like this because they're very close.
- One night, they had a long talk until the break of dawn. Yesung said that it really felt like they were friends at that time.
- Once, Kyuhyun complained about Yesung not taking him to go shopping with him when they were in Japan without Ryeowook. He said he felt alone whenever Yesung went out with his friends.
- Yesung compared Kyuhyun to a waterdrop because "people can't live without water". He added "drop" to make it cuter because Kyuhyun is the maknae and has a cute image.
- When asked by a fan if they're awkward when they are together, they replied "not at all!" and even said they were close.
- Kyuhyun and Yesung had an argument during "When We Were Us" promotions (the actual reason is unknown): Kyuhyun asked Ryeowook and the staff to leave the waiting room and wait in the hallway while Yesung and him have a talk inside. They stayed in the waiting room for an entire hour to resolve their issues and, according to Ryeowook, they became closer after that.
Eating, Drinking, Sleeping
- They ate Kobe beef together after a KRY concert (Ryeowook didn't want to come).
- They had beer, pizza and seafood in Busan (SJ's Experience Korea).
- The two of them drank together a month before Yesung's discharge (150401).
- They went to a sushi bar together in Jeju Island. According to Yesung, it was delicious and not expensive.
- They spent Christmas Eve together even though Yesung felt sick that day. He didn't want to cancel their plan and went anyway to spend some time with Kyuhyun (191224).
- They went to a cafe together then ate ramen in Osaka after their Super Show 8.
- When Kyuhyun had to go to university, Yesung often woke up because of Kyuhyun's alarm clock in another room and would turn it off himself.
- During Yesung's military service, Kyuhyun would send Yesung cute messages when he drank.
- Kyuhyun always talks about Yesung not eating enough ("Yesung hyung doesn't eat!! He eats five dinners a year!!!") and his lack of sleep. His concerns were voiced in the special episode of SJ Returns 4, "We Live Together", when they spent a whole day with each other.
- Kyuhyun implied that he wants to cook for Yesung in the future.
- According to Kyuhyun, Yesung always orders one glass of beer when they go for a drink, and sip on it while assuring "I'm drinking!". He plays mobile games and stays until 5AM. Regarding Kyuhyun, Yesung said that he knows a lot about alcoholic drinks and nags others when they're not drinking enough.
- Kyuhyun chose Yesung as the member he'd like to go to a cafe with. He himself doesn't like coffee but still wants to go with someone who knows a lot about coffee so he could hear them talk about it. According to Kyuhyun, Yesung is the right person to drink coffee with because he owns a cafe, so he has great knowledge. Then, Kyuhyun explained they went once to a cafe together and took lot of pictures, so he'd like to make these kind of memories with Yesung.
- Both of them really like vanilla latte (even though Kyuhyun isn't much of a coffee drinker).
- Yesung thinks Kyuhyun looks like his favorite actor, Leonardo DiCaprio (when he was young). He thinks their noses are similar.
- Yesung and Kyuhyun both picked Shin Hyesung as their role model among Shinhwa members.
- Once, they hugged for 23 seconds during "The Night Chicago Died" (SS1).
- Kyuhyun likes Yesung's little skits in which he pretends to be shot.
- During Kyuhyun's two-years break, they attended the same wedding in Jeju Island.
- Kyuhyun thinks Yesung wearing a choker is sexy (SJ Returns 3, KRY Beyond Live).
- Between Yesung and Eunhyuk, Kyuhyun picked Yesung as the member he'd like to be with on a deserted island (Weekly Idol).
- Kyuhyun wants Yesung to teach him how to take good selcas.
- Kyuhyun chose Yesung as the most charming member (Idol VS Idol).