you're Xiao's best friend and you've been friends with him since both of you is still in the Junior High School, now you're working and getting a high paid (you choose your job) and Xiao is a CEO

but one day as you look in the mirror ad starts coughing flower petals, you know something is wrong, something is not right, you got the Hanahaki disease and then you realized that you love Xiao but he doesn't love you back. The only cure is to make him fall for you