The mirrored lines between Han Tae Sul and Kang Seo Hae are on point. Here are two that I found:
About connection:
KSH: "You're the only person I know whether from the past, present, or future"
HTS: "You're the only person I can trust whether from the past, present, or future"
About not letting the future self define them:
KSH: "You said that I'm going to fail, but I'm still going to try. Because I haven't done anything yet"
(KSH: Everyone will die because of you, even my mom--) HTS: I didn't do anything yet!
I would love to know about other ones I have missed
