The movie depicted how the heroine, after the death of her fiancé, could never let go, so she decided to write a letter to Heaven for her deceased fiancé.
She addressed the letter to her fiancé's high school address.
Unexpectedly, she indeed received a reply signed by her husband.
The heroine wrote another letter back, and soon received another reply, but the content of the reply was asking who she was.
After a series of letters, the heroine found out that the woman who had been replying was her fiancé's high-school classmate.
Moreover, her name was exactly the same as her fiancé's.
Upon the heroine's request, the woman shared some stories about her fiancé's high school days.
Only then did the heroine discover that her calm and restrained fiancé had also had a cheerful and bright side.