Taiyou no Kisetsu (2002)

the lead is once an all around nice guy but because of his tragic past that happened to him is now living in revenge, grudge and hatred...

The leads are in a similar situation, both seduce a rich woman in order to gain something and both fall in love with nice woman who is always by their side.

These are two vary similar dramas, they both have vary interesting plots both dark and handsome characters who use their looks to deceive people.