Overall, it's like Raising a Bat with a lot of unnecessary miscommunication and misunderstanding. The main story ends before Hyesung ever fully develops as a character. He remains the same from start to finish. His math talent is also never made good use of. It's more of a loose end than anything. The relationship dynamic between the main couple never improves.
The extra stories are good however. I like the other couples more than the main couple
Love Is An Illusion