Yes, this is a happy ending, but exchanged with Yokodera losing all kinds of memories from the past, present till the future. Could we even call it a Happy Ending at all...
This man willingly walks the path of five-timing without whining or asking. Even while knowing getting busted will net him some holes in the stomach. Truly a madman, and a GOAT
For a unmarried man and woman to stay at the same room is considered a taboo is generally called "Nam nữ thụ thụ bất thân", it is an old custom which is arranged marriage (yeah you didn't hear wrong, the arranged marriage you've always seen in mangas, manhwas, manhuas,...), so if a couple stay...