I never thought about it until I saw your question, since I usually use my super limited memory space to remember the ones I love instead of the ones I hate. And now that I'm thinking about it, I realised there isn't any that was horrible enough to the point of leaving a deep impression.
I guess my bottom line is really low. Nothing is worse than ...... reply
I'm looking for manga/webtoon/novel that is similar to At The End Of The Road (webtoon) and Kill The Lights (novel).
The main plot is basically the MC died and woke up in another person's body. The ML then, through some interactions, recognizes the MC even with his different appearance. (Because the ML has always love the MC.)
No Quick Transmigration please, as I've read most of them or the new ones have too little chapters for me to get into it.