Responses
It's not about being an expert in relationships, it's more that they lack the maturity that comes with living to that age.
It's not a personal flaw of Jiho, it's a flaw in writing. If the characters were college aged or younger I would understand why the author made their personalties out to be like this. But whatever is going on right now doesn't feel like a realistic relationship between adults in their late 20s.
Y'all didn't fumble hard in your first relationship? So you all were good communicators who knew exactly what to say and how to make your partner feel better? Chill