Depressed boy VS sickly wealthy boy.
The gentle secret love in the diary VS the paranoid bondage in reality.
The two met in childhood, using candy as a clue, and then the entanglement of love and pain after their reunion in high school. They separated when their love was the strongest, until they reunited in a straight line after college.
The diary they kept in high school is not only a testimony of their love, but also a relic of their youth.
Concept: Two male protagonists, secret love, straight-up confession