I've never read the webtoon so I can't compare how accurate it is.
But as a stand-alone drama, I thought it was really cute! Amazing lead characters (the 2 male leads are such heartthrobs omg), cute side couples, great comedy... Definitely go for it if you like rom coms.

You have your typical warm second male lead and evil second female lead, but the two main leads are decently smart and mature in handling their obstacles such that the plot doesn't get unnecessarily draggy and misunderstandings don't take like 1/3 of the drama to resolve.

If you watched Extraordinary You, you'll recognize the same school as well as some major cameos by the previous actors... Keep your eyes out for those! The Kim Hye-yoon + Lee Jae-wook one was especially fun XD

I'd also like to make the point that Chani plays a falsely-accused, very misunderstood character again...
This is his 3rd time? Signal, Sky Castle, now True Beauty. Sosad...