at that one part, the fmc didnt throw herself onto the guy because she wanted to, she confused the guy for the male lead, you completely missed that she was pretty drunk (that why the blushing, beside you can see her drinking before that), so the guy ended up going along with it until he told her it wasn't the ml, so the ml ended up showing and take her with him (he did show up pretty fast because of a text she send to him), the guy tell the ml that he is just hurting her with being friend with benefits, the ml tell him that they are going to stop, after the fmc wake up the ml declare his love to her and after some sex, they stop being friend with benefits and become a couple, after friend show up at her house and talk with the mom and with some hope, the fmc tell the mom that she already got a boyfriend, you can see the dude heart breaking and you see the friend and fmc walking, dude say to her that he love her, but she didnt hear him cuz it was raining, after that is probably the last time you see him, cuz he was leaving anyway lol, ml go to fmc house present to the family, and he declare that he want to marry her, after that some woman show up, probably a previous lover of the ml, and you see the fmc with some anxiety for god know what reason, probaby cuz of this woman she haven't met yet thats so far what i read up to 19