So basically the “dude” was friends with her bullies in high school he didn’t particularly bully her but his friends bullied her and he didn’t notice or he was nonchalant about it. They met again but the guy didn’t recognise her(she did tho) and then she did get revenge (she started dating him on purpose but then fell in love) then she went abroad to study.
Thanks so much!!
(๑•ㅂ•)و✧
To add more context:
Gaeul and Soobin back on their middle school days, exchange an anonymous letter with each other (Soobin is not aware that Gaeul is the one that he exchanged his letter back than). Gaeul's bully who also a close friend of Soobin knew about this and starting to bully Gaeul (she doesn't like other girls to be close with Soobin). Soobin once saw when his friend and her gang bullied Gaeul and his response was just "don't do that" (he just being a bystander anyway, that's why a lot of his dialogue when he save Dongchae and this chapter shows that he regret for being just a bystander). Also during this time, Somang also got bullied by them for siding with Gaeul but later Somang and Gaeul go to a different high school and the bully continued since Gaeul also going in the same high school with her bully.
Moving forward to college days, Gaeul and Soobin met again. Gaeul think she wants to get a revenge on Soobin since he just let his friend bullied her. They ended up dating and the mainly reason why they broke up is because their relationship was "toxic" (all the revenge plan, etc.) to begin with, that's why they (more like Gaeul) decided to broke up before Gaeul going to London for study exchange
Does anyone remember why they went their separate ways? And what the dude did for her to want to break things off?