Both are korean mini dramas with romance and friendship aspects that mostly center around the life of three friends. Also, both male leads from its okay to be sensitive appear as male leads in just one bite and their characters are similar too. One portrays nice male leads while the other is involved in an older woman/younger man relationship and is very protective. Theyre available to watch on youtube.
Heesooks and Taesungs relationship kind of reminded me of Flat. Theyre both younger male/older female stories where the guy has been crushing on the girl since high school. Back then it was just a one sided crush but now that the characters are older its starting to become requited. Apart from that theyre both cute short mini dramas that you can find on youtube.