I’ll be brief. This is a cute and original story. The FL is really cute, ML acts well and all other characters are all doing an amazing job.
Problem is that in the middle of the drama, the characters start not to make sense at all. Ms Ahn is the worst. She doesn’t accept her son, claims she does this for her step son, refused to help her son when the only person who loved him died ... but then intervened and literally forced Seulbi to leave her son pretending that it’s better for him to be all alone!
Then, the step son ..... how immature can you be? It hurts. I can get it, but to be violent with your step mom, to hurt the only persons who were there for you to feel better .... and the father who is a cop, doesn’t do a thing when he realizes the situation. This kid needed a good slap to get some sense out of him. And so the mom/step mom!
Now the FL..... her cuteness and kindness becomes annoying cause she is so naive that she keeps being wronged without fighting back or at least avoiding to be involved in more problems.
The bullies ..... no comment. Characters are as frustrating as above. And same goes for Angel sunbae!

Overall this could have been an amazing drama, unfortunately it felt short. Just be warned that this drama might disappoint you after the 1st 10 episodes !