I'm following you then! Maybe you didn't like the protagonist? She is... special. If you'll try to reread it I advise you to first read the spoilers on this forum because the plot gets unhinged in the last part of the manhwa.
Maybe that is what it was, the plot got way to complicated. I am so thankful for this site because I must be a little special, as even the most basic plots tend to lose me. Yah I think Heerans love song is probably one of my faves, one that I AM OBSESSED with is Broken Ring this marriage will fail anyways, it is so good and the art is stunning!! Ive reread it at least once a week since its release.
This site is the best and everyone is super helpful. Heeran Love Song is amazing! If you like it you might also enjoy the manga Angel Sanctuary. Yato seems really similar to another demon who is in love with a special soul. Even their designs are similar. I didn't know Broken Ring but I will check it out for sure!! We may have similar tastes :)
