A Retired Old Sage Takes His Disciple on a Journey is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

“Shall we, go on an adventure like in the old days?” Although he was an orphan, Roge trained hard and became known as the “Sage.” His beloved student, Liliane, suddenyly came to visit him. “Roge-sensei… I… have been expelled.” Liliane has been employed as a royal court mage, but after being exhausted by the harsh working environment and shady human relationships, she was fired without being told why. In an attempt to heal her exhausted heart, Roge invites her on an adventure to relieve her heartbreak. “Sensei, I want to travel with you, to relive those bright days once again!” And so begins a slow-pace journey, following the paths they once travelled together, but the two, who are both too talented for their own good, end up leaving legends behind in every place they went…