Xiao Tan originally thought that Lin Shuanghan was as his name suggests, and he could frost fourteen states with one sword, but he was actually a doctor.
Lin Shuanghan originally thought that a girl with a Zen name should be gentle and kind, but she could become a demon all in one thought.
As a doctor, he decided to save her.
Okay, Lin Shuanghan, I'm waiting for you to save me.
A gentle male god who was considered unknown at birth but remains true to his true nature & a righteous female disciple who is kind on the outside but dark on the inside.