The story was interesting in the beginning but as it progressed ML developed feelings for the FL as soon as he knew that she is not blood related.

Sibling relationship is one of the purest. You need a convoluted mind to jump into a loving relationship with someone whom you knew lifelong and called sister. Even after getting past this complicated relationship, I couldn't enjoy this because of the ML acting. He is like a statue with no emotions(This is not the only drama that I have noticed). Eyes should speak volume but he barely blinked his eyes. A great actor uses eyes to convey sentiments and passions but I noticed none of those.

Many people in the comments praised the ML voice. Just remember he is an actor not a voice actor. One should possess great acting if not the other.

I continued watching this for the FL , SML and the step-mom acting. The legal step-mom character was so bold and refreshing and she portrayed it very well.