i will start with the good stuff: Both actors portrayed their roles great. The ML's change in character after the FL came back was very well done by Gong Jun as he managed to seem both aloof and afraid of losing the FL again at the same time. Also the scene where he cries in the apartement thinking of how much he got hurt in the past was very emotional. Honorable mention: the kid actor!!!! he is clearly a natural.
However i would not recommend this drama because of the turn the story takes. The FL decides to leave the ML with no explanation whatsoever because she "loves him and that's the only way he will go abroad to study". I wouldnt complain about this if it happened at a point when she couldnt leave her job, but it happens exactly when her business falls apart and she has to sell everything. Plus she decides to go abroad ANYWAY, just not with him. This does not make sense. After she leaves she finds out she is pregnant and simply does not tell him! The story takes us 6 years after that: the ML has returned from abroad and is now a professor (and a father, he just doenst know) and the kid (5yo) decides to take a plane and head back to find his father. So if the 5 year old hadn t decided to come back, the FL wouldnt. Anyway, they "begin again" after that and iit has a happy ending but it just seems to far fetched for me.
The music is nothing special.