Caste Heaven
Crazy plot! Twisted roles! However twisted the behaviors of people around, know who you are, know your ground and stand it, do not let other actions affect your emotion.
If You Hate Me So
Hyung Jinhan good at faking that it feels good, he is can also detect what type of person his talking to and able to counter such attitude of such type ("obsessive type, cute type, serious type, independent / dependent type, persistent, passoniate, crafty types ... )
Life Senjou no Bokura
love till we get old and die
Konya mo Nemurenai
Sequel - http://www.mangago.me/read-manga/kimi_to_kore_kara/ 1 wish for contract to a demon
Hidoku Shinaide