I liked it.
The story has a good premise, as someone could changed is behaviour and personality due to a transplant of a muscle.

It gave me chills just to imagine the business war in Korea! Lots of corruption, backstabbing, etc ...

The romance between Soon Jun and Min Ho is interesting. Don't understand how couldn't she find out that his actions seemed like someone else ..

The plot I didn't like it. The sabotage, the international enterprise, etc.

PLOT - interesting but that is it.

ACTING - good acting from almost everyone. Didn't know the actors but I like the performance...

OST - I really cannot remember any music

REWATCH - maybe some scenes with Min Ho and Soon Jun.

OVERALL - if you like a romantic story that is mixed in a so and so plot this is good