That's true. But maybe because of their current ages right now, that's why it's hard to see some chemistry between MC and ML. Personally, I like how there's virtually so little chemistry existing between them at their current age because it would be weird. It's how ML likes MC but it's clearly depicted as being fond of someone younger than you and not seeing them romantically. Their chemistry might get better when the MC is older.
I mean thats my issue with their pairing-I hate the age gap and would prefer romantic chemistry didnt develop between them at all.
There's already more chemistry between Heuk and the FL than the original guy...smh.