Seol-min's feed

Is Yeonwoo's memories sealed? Is there something more about their relationship? Like maybe they knew each other but something happened that's why they don't have any connection with each other with what the mc remembers but now, something changes again and it's the og Yeonwoo with sealed memory who loves her sm to the point of obsession? Like diff timelines where one remembers the other but the other doesn't? And it keeps on repeating it broke the system?