This drama has pretty good elements, from cast to story. As you can expect in the title, perfect and casual, there's a character that is taking on the role of perfect and there's another that ruins everything with their casual ways.

For a contract marriage, I did not expect Si Nian to actually be this sweet throughout the drama. There are moments where you can see the way he treats Yun Shu is all for her best interest which is great and he doesn't do it in the "I'm going to bully you" way but in a caring way that lets her understand.

I honestly forget that they were in that student-teacher relationship throughout the series because it's both their first loves and it brings on that perfect first love vibe.