Well actually actually that's not completely true, if he falls in love it's actually more because of Seowoo because everytime he opened up to Jaewoo it was because he met the real Seowoo and he feels comfortable with him. Evident in the way his mind always lingered on the moments he shared with him.
Although yes, Jaewoo did out in work such as hanging out with him, but but succeeded because Seowoo was giving him information, let's give credit to both twins where it's due.
It's fair game so far, we're just more attached to Jaewoo because we've been seeing him more, so naturally we sympathise with our tsundere more.

is it wrong of me to ship ohn with jaewoo because if ohn ends up falling in love too (which he will) its because of jaewoo not saewoo