I don't really get why this is a classic. Yes, Hyun Bin is fantastic at acting but I just hated his character so much ugh. Overall it was pretty boring, nothing happened (except when they change bodies, that was actually really fun to watch because again: Hyun Bin) and I couldn't buy the romance because how can you get to love someone that controls you and stalks you that much? However, I actually really enjoyed Oska and Yoon Seul's bits and the ost as well. I'm not going to say 'don't watch it, it's horrible' because I've seen worse but I can't recommend it and I'm actually really disappointed because I had really high expectations. Don't be hyped, look away whenever Joo Won's being dumb (lol that's like most of the time), focus on the good things and you might actually enjoy it.