I started True beauty without any expectations. However, this drama has left a deep impression on me and here is why:
1) the insecurities and hardships that teenagers have to deal with;
2) how the teenagers are responding to their insecurities and their hardships;
3) what the definition of true beauty really is and the acceptance of it;
4) what the value of true friendship should look like;
5) how to be logical and when to let go if you cannot be with the one you want; and at last but not least
6) how to be confident and not to let go if you are certain about things.

The story is well written and the actors managed to convey all of the above messages. The focus points of this drama was never about the love triangle, but about how to deal with your own insecurities, hardships, value of true friendships and being logical.

Overall: I would say that the story is a 10/10 and the acting is 10/10 as each actor has portrayed their roles really well. The OST's are also a 10/10 and the rewatch value is 10/10.