
can someone explain what is going on? genuinely lost

MTLing ahead: It's poor writing.
and SPOILER WARNING (chapter 25 should is the most recent, and ends where Seryon confesses to MC - so 2-25 is a full flashback)
Sister wanted to know how Seryon feels about her, so all the stuff she does is just do find out that. They have been dating for roughly half a year when she breaks up with him, when she confronts him about his reasons for meeting/dating her ( answer: he "likes her like the dog next door")
She also calls her brother and tells him they broke and are only friends now, which happens before Seryon confesses to MC. So the first chapter is pretty shit actually, as when he confessed the MC should be fully aware Seryon and his sister broke up.
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