Warrior Grandpa and His Supreme Granddaughter

A fallen clan, a lone survivor, and a warrior grandfather. Jinsan Yu, once a legendary martial artist, swears to the heavens he would survive until Seol, a child with an extraordinary gift, comes of age. Through fate's hand, they encounter allies and enemies alike from the unlikeliest of places, and unearth deep conspiracies concerning the Yu Clan's downfall. "I'll protect you, Grandpa!" The supreme cry of his youngest granddaughter ignites a dying warrior's spirit.

(Source: Webtoon Entertainment)