Nothing you say negates my comments at all. YOU may think they're a couple right now, but Shiho certainly doesn't think so. He clearly does not think, know or believe that Yul likes him in any other way than a friend that she's known for ten years. Her reluctance to get off the fence, one way or the other, will be the ruin of their relationship, unless you think Yul can keep up this farce for the rest of her life and Shiho will accept being nothing to her other than a friend for the rest of his life while she has various boyfriends, marries someone else, and lives happily with someone else by her side.
'Yul and Shiho romantically like each other yes but they aren't "dating". More than friends, less than lovers'
Bzzt. Shiho likes Yul romantically and she knows that, but as far as he knows, he is JUST a friend to her and she does not like him romantically in the least.
Ten years is way too long for Yul to continue this charade. Instead of continually giving him hope by telling him to "work harder," she should either accept his confession or tell him definitively that they will never date, that they are just friends and will never be romantically involved with each other.
I, for one, have been paying to read this on lezhin since the first chapter. It's currently up to chapter 43, and it's still looking very bleak for Shiho.