Some of the reviews confuse me - I thought the plot was coherent and understandable, and the acting was good. The chemistry wasn't burning hot, but that really isn't the characters - both of them have never been in love before.

Anyway, I will agree that the loanshark plot element was unnecessary and would have been better left out. It didn't ruin the series, but it chewed up time that could have been spent on the characters. For example, I felt like there was a step left out of the progression of Jin Won's feelings.

There are a few tired BL staples, like the taller one catching the shorter one when he's falling, etc., but it didn't bother me that much because normally it's the fall that actually generates the interest, whereas that's not the case for either character. The moment Jin Won falls in love is motivated and makes sense in the plot, and we see the full back-story of Sang Ha's feelings.

Lee Se Jin is a better actor than Cheon Sung Ho, but he also has a more realized character to play, and holy mother of God is he cute. Seriously, you almost feel like you should kick a puppy so the balance of the universe isn't upset. But CSH does a good job and he does subtly show us Jin Won's feelings underneath the bravado.

I gave it a high re-watch rating because I rewatched it. This won't change your life, and the other two series are better than this (BTW, Jang Eui Soo has a cameo), but you will smile a lot and be happy, so I would watch if if I were you, because if you're reading this, you're likely another BL fan and this checks the boxes.

The title is odd - the Korean title doesn't use the Korean word for "heart" but rather spells the English word "heart" (as approximately as you can with the Korean alphabet). I don't know what that's about, but The Pacemaker would have been better since the most common use of that word is to describe a device that makes your heart beat.