I know where you're coming from, but in here case she didn't actually get to experience getting older like ijun, she spent all that time fighting monsters inside the gate, she didn't get to experience real life things, in a way she's still the same age... so i don't really mind whoever she ends up with
I don't support either because I don't care about a romance that hasn't started. I just didn't like the fact that you tried to make MC seem older than she actually is just based on her personality. All three of them are adults, but she has a mere few years above Shin, while Ijun has 30 years over her. That's some major glossing over.
MC literally mentioned in internal dialog that when she was in the gate it was only a few years but outside of it 30 years have passed. Even mentally she should be only in her 20ies, trauma aside. Meanwhile her former team member is now 30 years older mentally and physically(although he looks hot). She's stoic and not used to modern technology but she's closed to the youngsters in lived age

Mc is old, like literally. Mental age is important rather than body age, I want Ijun to be the Mc. Shin is a kid for fks sake compared to her. She had lived too long for it, when a kid mc from another manhwa is paired up with a fking adult, it's a crime. Makes sense man, she just looks young that's all. All I care for is, if there is romance , only Ijun fits it. I support Ijun.