The sun this year is hotter than any other year. It is not as cold as when we first met, but it is like the light she shined on me when we first met. This is the last diary entry, the most ordinary day, and the first suicide note. Ah Jin, thank you. I'm sorry.
Purpose: Secret love is something unknown. Thousands of girls are showing off their secret love here. They have cured themselves, but they cannot save themselves.