Zero0: A Space-Time Mage

What if your future self appeared to guide you? Haruto is a magicless stooge in a world of mages, but everything changes when his future self appears and alters his destiny. However, with great power comes great challenges. Thrust into the spotlight, Haruto must face relentless trials while following the guidance of the person he is destined to become. But one question remains—why has his future self traveled back to the present? What does he want from Haruto?

(Source: WEBTOONS)