Kate:
sorry, but just because he wants to be friends and does not know how to go about it, does not mean he is not bullying him. Even in the preview the "fake script" for the presentation and makes everyone laugh at Da Yeol - bullying. for me, in situations like that, the impact the actions have on the person is more important than the intentions of the person who does it all.
In coming episodes you would see the Push and Pull feelings. When Tae Hyun avoid Da Yeol, Da Yeol feels emptiness too.
When Tae Hyun Push the bond Yeol will pull it again and again Yeol will Push and leading to Tae Hyun pulling it.
It is really not the typical bully and his friend story too. It's different from what we expect.
But I don't support even 0.00009 % of what he did in School infirmary and with Presentation too.