Zuo Jiangfei admires the senior sister who raised her, though she believes her feelings are unrequited. She can only keep her love buried deep in her heart. That is, until outsiders disrupt their lives and the two are dragged into turmoil. Around the same time, Zuo starts having strange dreams. She keeps dreaming that she and her senior sister, Feng Luan, have switched places, and she feels guilty, believing she has desecrated her senior sister in her dreams.
Later, Zuo is gravely wounded. To save her, her senior sister uses herself as the test subject for a medicine, only to turn herself into a living corpse: no heartbeat, no warmth, and no emotions. Her senior sister still protects her, always standing in front of her, and even... But she no longer gives her a pure smile or affectionately strokes her head...
Zuo Jiangyi has turned herself into a living corpse. She still carries her memories from before. She knows she has an adorable junior sister, and remembers that she loves her. But she can no longer understand what love is. So she can only follow the instincts of her body and search her past memories for ways to show that love.
She remembers what her junior sister likes to eat, and what styles of dresses she loves...
She wants her junior sister to be happy, even though she herself has forgotten what happiness feels like.
But perhaps she still isn't doing a good enough job. Her junior sister used to smile often, but now she always looks miserable. She wants her to smile more, because she loves watching her smile. So she sets out to find ways to cheer her up. One day, she finds an illustrated book in her junior sister's room. She flips through it without changing expression. Its contents overlap with certain memories from her past. Her junior sister should like it very much...
Theme: Love is found in the spring sunshine and blooms everywhere.
