kwoon:
Where FL or ML is a twin or doppelganger and takes over their counterpart's identity

Main character's soul enters another person's body and takes over the body's identity:

Rang rak prang Jai - ongoing Thai Lakorn 

Second Husband - it is still airing right now, the FL pretends to be an investor "Sharon Park" in the second half of the drama to get revenge on the FL villain and uncover the truth over her being framed for a murder. The episode count looks high (120 eps) but it is addicting so far every episode ends in a cliffhanger that makes you want to watch more of it. 

KO 3anGuo
Not Me
Who Are You? (Thai-version)