Si Wan transformed into a handsome schoolmate, shaking the hearts of many fans.

Si Wan recently filmed a commercial for a health food 'U&Z' for the company KGC Life Engine, showing a handsome schoolboy look.

In the pictures, Si Wan is showing a smart, intelligent student look. The smile that he showed through his role in MBC 'The Moon that Embraces the Sun' can also be seen here.

Netizens commented, "Ah, if someone like him went to my school, I would go to every lecture," "Please be my schoolmate", "What am I going to do with that smile, so much for sleeping tonight", etc.