The Check-In System, Starting with the Sunflower Martial Art for Eunuchs

One day, Lin Ping realizes he has transmigrated to a martial-arts fantasy world set in a historical era and is now a little eunuch in the Grand Xia Dynasty! Lucky for him, he receives the Check-In System! [Ding! Congratulations to Host for successfully checking in. You have received the "Sunflower Manual".] [Ding! You have successfully checked in to the Hall of Golden Chimes. You have received the "Heavenly Dragon Fist Martial Art".] [Ding! You have successfully checked in to the Imperial Pharmacy. You have received the "Big Reward Pill".] .... .... This world is filled with dangers lurking all around. Therefore, Lin Ping merely wants to cultivate silently and secretly, as well as to clock his regular check-ins, in hopes of regrowing his "third limb" one day. He has never thought of participating in the struggle for power. That is until 10 years later, when the northern barbarians come to the capital to probe the strength of the Grand Xia Dynasty. The capital is in imminent danger, and the palace is filled with internal conflicts and a lack of powerhouses. Thus, a little floor-sweeping eunuch is forced out of seclusion…