Xie Yan is a guardian who walks in the shadows: silent and restrained, with a firm grasp on everything. He can shield her from every storm, yet doesn't dare reveal even a fraction of his feelings.
Su Nian is a quiet, self-effacing intern doctor. Sensitive and timid, she buries her budding feelings deep inside and can't even bring herself to believe she could be loved.
Six years apart, and the weight of a solemn promise to care for her.
He steps forward an inch, and she retreats a fraction.
He hides his tenderness in the passing days and nights, locking his devotion away like a prisoner;
She conceals her unease behind her composure, letting her affection end in silence.
He doesn't say he loves her, cross the line, pressure her, or leave.
By day, a prison; by night, a cage.
For this lifetime and the next, my heart holds only you.
