Yuttakarn Prab Nang Marn (2018)

both have sisters that are in love with the same man. only one of them is married to him and then she dies. the other sister remains by the side of her sister husband hoping to seduce him but he is not interested. that sister secretly hated her sister for taking the man she loved.

-In both drama FL have misunderstanding of sexuality of ML
-In both drama ML & FL share one house
-In both drama ML betrayed FL for his benefits
-Although personality of character and story of both
drama is different

both fl are ceos/hold high profile job post and are hated by everyone in the firm. and consider the fls to be nightmares. ML in both cases are the fls' subordinates. PA in yuttakarn and intern in IIMH
spoiler: the catch is that in yuttakarn, the ml joins fl's firm with an ulterior motive to spy her whereas in IIHM ml has powers and realises fl isn;t actually bad

it's similar except the ml chases the fl instead
the cold boss trying to act cold but are actually really nice to other