It’s actually pretty true. People who aren’t overwhelmingly beautiful end but great at acting end up as character actors, and Korea doesn’t have a reputation for paying them much (last year a famous female comedian/character actor was revealed to be living in a complete dump despite years of being in the industry, so that aspect is very true, Korea is one of the biggest lookism based society).

Honestly, I don't like that the author chose to make him unsuccessful in his career, especially since he is supposed to be this genius they are trying to make him seem. Appearance is limiting for every role, and you don't need to be conventionally beautiful to become a famous actor.