CONTROVERSIAL OPINION:
I feel like the ending is lacking something. It's not an ending I personally expected, though it still came out good. But, it's lacking something I cannot grasp. Perhaps it's because In-Ho's puppy personality lessen ever since the climax. But I guess it just portrays real-life relationship and how a simple misunderstanding can take a toll on a person. (which you can rarely encounter in BL world.)
The brother is HIGHKENUINELY a homewrecker. I'm not jinxing nor manifesting that negative energy, it's just the facts ¯_(ツ)_/¯. Jaeyi already said that he knows someone (his brother) who experienced the same thing as Ideum (the reason why the brother stopped swimming) likes to TAKE THATS NOT HIS.. So.. expect that the brother bitchy will try to take and steal Ideum from our man Jaeyi(っ˘╭╮˘)っ