spoiler [this has been taken from another person's comment on reddit ]
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"they don't "officially" end up together but they share an extremely, EXTREMELY close bond that's wayyy more than just friends IMO. Also in the end, they're still single with no other partner, though I guess that could change? But there's like a 0% chance of that happening. Hyunjae's reasons for marrying were not in his control and against his consent and Yoojin crashes his wedding. I'm not sure which instance you are talking about for Hyunjae leaving because he does that a lot in the story...they tend do have a lot of "breakup" arcs lmao. But yeah they don't end up romantically get together no, although they're probably like...one romantic confession away from it being canon"
[another person's comment:]
"they tell each other that they love each other near the end (yoojin doesn’t say it bc of the skill, he says its a reflection of his actual thoughts), they have a child named han gyeol that was born through magic, but they’re technically not in a canonical romantic relationship"
here's the link to the reddit thread: https://www.reddit.com/r/SClassesThatIRaised/comments/1e0tu70/do_han_yoojin_and_sung_hyunjae_end_up_together_at/?rdt=48455
if you still don't believe me, feel free to go to the comment section of SCTIR here on mgg and ask the fandom yourself.

Bro I really liked it at the start with the mcs cold demeanor and his seriousness but I think he's becoming another Han yoojin, kinda disappointing ngl