Sorry I suck at narrating but here goes..
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Wonjae will be a bit kind to Cheongwoo and that's why he is kinda falling in love with him. But when Wonjae and the red hair guy talked about Wonjae was just using him for his essence and found out what he did to his friend to manipulate him into becoming a fairy, Cheongwoo was deeply hurt and escaped again. Wonjae got crazy looking for him because he ran from the mountains, blizzard and all and he can't track Cheongwoo by his essence. CW also went to Wonjae's red hair friend to get back his money (the one that hus friend "borrowed" and he also gave him extra 3 mil won bec he is happy that CW is giving Wonjae a hard time looking for him. After that he happened to bumped with the guy who gave him the walkie talkie, offered to help him and CW accepted. He offered CW to work at his relative's place and later on when he thought Wonjae is no longer following him, he went to see CW. Just when we thought he is this good guy, he made some advances to CW. He was probs tempted bec of alcohol. Nothing happened and he apologised to CW. When CW went out Wonjae and his men already found him. Ofc he followed Wonjae, bec he was afraid that Wonjae will hurt the walkie talkie guy. Back home, ofc he's confined again and he's also rebelling. Whenever he does that Wonjae will blackmail him abt his grandma. Bec of stress CW got sick and in his delirious moments he told Wonjae how he now hated other people touching him other than Wonjae. When he got better, he was brought to his old house and was told that Wonjae will now let him go. He can go back to college, and he will also take care of his grandma all courtesy by him. He thought he will no longer see him but he still went there after a few days I forgot what he said but he was pursuing him because he love him. Grandma gets awfully sick, needed the surgery but was bumped off (forgot why) but Wonjae came to the rescue and CW was crying helplessly saying he will do everything he wants just save Grandma. So Grandma was saved and this was the time CW was brought to Wonjae's family home. Grandma was also taken there after recovery and there he found out that Wonjae was already planning to take her there even before he escaped. Wonjae's parents adored CW especially his mom bec they have the same constitution. They lived there then that's it.

This story is like the title itself. How Wonjae's need became obsession and eventually realisation that he loves Cheongwoo. For those who've read the novel like me they would agree that this is not a beautiful love story. It's kinda like how it is when an evil person or a villain will love someone and how he got his happy ending.