I’ll post this here and hopefully someone will come across this but here is a synopsis of a minsung one shot (from someone on reddit) that I’ve been looking for a week now :((
Minho was going to a free rooftop concert for Nothing But Thieves but he was nervous because he was afraid of heights and Chan couldn't go with him. But he showed up and he was amping himself up to get on the elevator to the roof when Jisung, who was also going to the concert, showed up and offered to go up with Minho because Jisung was also scared of heights.
Maybe they held hands but I can't remember.
They were on the rooftop with tons of other people and Nothing But Thieves was playing some of their songs. The writer had written in specific moments where different songs were playing. I remember that Minho was really anxious about being up on the rooftop. I think they were about to part ways when Jisung noticed how nervous he was so he offered to stay since he had also come alone. So he and Minho were spending time at the concert together, dancing and telling stories. There was also a lot of "damn he's cute but he doesn't like me like that. Does he??" moments. It was cute.
Lover Please Stay started playing and the mood changed.
Minho and Jisung started slow dancing together and I think in that moment one of them had confessed how much they liked the other even though they had just met.