Lunar Mansions / A Couple's Afterheat

Koushi, a young man brimming with curiousity, is an apprentice doctor working under the only doctor in town. He respects Doctor Xida, despite his seemingly unfriendly and misunderstood demeanor, and he prides himself on being the only one who can understand him. However, one day, Doctor Xida is visited by government officials who command him to go to war. Koushi, overwhelmed by their sudden farewell, is suddenly visited by Xida one night...
Source: Renta!