Aein PUZZLE

About this title

Gyul, the outcast of the entire school, who used to be unable to get away from dangers without Ri Rang's help becomes strong with a sword obtained at an antique shop?! Hot-tempered, unruly fighter Woo Ri and my best friend Gyul suddenly seems different? My heart beats when I see Gyul!! Without knowing my eyes turned to look at his lips, and I could feel myself blushing. This is not a disease, is it?