2008-
Go Ara
After youngsters ended rumours started spiralling that the two were dating because on their on screen chemistry but SM Ent denied the dating rumours and clarified that the two are just friends.
2014-
A member of SNSD (Seohyun, Yuri, Sunny or Hyoyeon, but majority thought the relationship was either with Seohyun or Hyoyeon since he is closest with those two)
After it was announced that Jessica left SNSD many rumours started spiralling online, one of them being that Jin Soo was dating one of the presumed single members of SNSD and the reason that Jessica left was because she had an argument with the member because she didn't approve of the relationship.
2018-
Son Ye Jin
After Jin Soo and Ye Jin starred on 'Something on the rain' as the lead couple, people were impressed by their on screen chemistry that people thought that they were having an affair as Jin Soo was dating Nana at the time but they both hilariously denied to rumours and that was the end of the rumours
2019-
Song Hye Kyo
After Jin Soo and Hye Kyo starred on 'Encounter' as the lead couple, people were impressed by their on screen chemistry but then it was announced that the Song-Song couple were divorcing after the show had finished. There was a rumour that Jin Soo was the reason for the divorce and he had an affair with Hye Kyo but it was denied by Jin Soo and Key Est + Song-Song couple (Hye Kyo)
2019-
Jung Yoo Jin
Rumours started spiralling that the two were dating a year after co-staring in 'something in the rain' when staff at a local restaurant they having lunch together at reported to the press that they saw them together and 'acting flirty' towards each other but Key East and FNC Ent denied the dating rumours and clarified that the two are just friends.