Kakafukaka

Why they are similar:
Famous male lead
FL suffering
Both ML has kinda disease (idk if we can call them disease) but of different types
Sleeping arrangements
Unlikely relationship
While my neighbour can't sleep is more of a cute type kakafukaka is more dark

in both titles, the male lead can't get it up for anyone except the female lead. This leads them to get closer.

Both ML & FL both just want to have physical relationship to stay away from loneliness but soon enough they realized they like each other. Nakao Masaki is an eye candy & he is super adorable with his clumsiness in the drama. Both dramas adapted from manga/comic book.

Both dramas are rom-com series except Kakafukaka is more for a mature audience. The plot involves childhood friends who reconnect after some time has passed. As they spend more time together, they start realizing their feelings towards each other and work on building their relationship.

The male lead in both drama give similar vibe. They are both reserved and very quiet. And got attached to their female leads