Dalhyena

Luck has only been on Yeon-Woo's side twice in his life: when he and his brother were saved by an esper named Seo-Joon, and when he reunites with Seo-Joon as a 20-year-old guide. Unfortunately, Seo-Joon doesn't seem to remember saving Yeon-Woo. Not only does the older man see Yeon-Woo as a kid, but he also makes it clear that he doesn't want to get attached to any guide. However, there's no telling what'll happen when their sync rate is so high and Yeon-Woo has had a crush on Seo-Joon for years...