I'm curious, what is the age gap between Mc and ml? Thnkss

I think 4 yrs. Im pretty sure Sayoung mentioned J is 4 yrs older than him

4, sayoung was 15-16 when J rescued him and j was barely 20. So after 8 years J is 28 and 240 is 24 but as time stood still in the rift J didn't grow old so physically he is 20.

Rather, he is mentally 20 too.