What's really creepy this chapter is that Jung showed that he knew what Sul experienced last year all along. That's really scary, because it shows that he really did do something back then, and it wasn't just some honest misunderstanding. D: He also showed that he's fully aware of how much Sul analyses personalities all the time. This means:
1. He's aware that she was analysing him (negatively) last year.
2. He probably kept his current behaviour under control this year, precisely with that in mind.
Just how in the world did things reach this point?
Seems like Jung's got a pretty good idea now of what Sul knows and how she thinks ... but maybe not as good as he thought? 'Cause he wasn't that surprised when she was completely dumbfounded at his confession, but he did seem surprised when she grabbed his hand. And his expressions were a bit weird after that ... I think? EXCUSE ME WHILE I GO JUDGE EMOTION BY ANALYSING THE SHAPE OF A WEBTOON CHARACTER'S EYEBROWS WHEN COMPARED TO THE DIALATION OF THE EYES IN CONJUNCTION WITH THE PRECISE ANGLE OF THAT BIT OF HAIR THAT'S STICKING OUT THERE. I WILL BE RIGHT BACK WITH THE RESULT OF MY CALCULATIONS.
Ahem, ANYWAY. I think you're right that Jung has been behaving himself around Sul this year with a specific purpose in mind, because after all it's Yoo Jung
we're talking about here, but what we're missing is a motive. I think some options we have are that he's planning to
a) get back at her for figuring him out.
b) allay her suspicions by making her like him (although not neccessarily by making her love him).
c) further annoy In Ho by going out with a girl he might
be interested in.
d) escape In Ha's clutches by ensuring that her main rival is an intelligent, hard-working young woman.
e) go out with Sul because he likes her/finds her interesting/has nothing better to do with his time.
And I do think e is as likely as all the others regardless of whether he appears to be Up To Something or not, because I imagine Yoo Jung to be the sort of person who would go about getting a girl to go out with him in the same way he goes about getting anything he wants (like a sneaky snake).