I Married the System After Hitting a Tree

Su Yuyin ran into a tree.

When he woke up again, he found that some inexplicable System had been implanted in his mind. If he didn't complete the tasks according to the System's instructions, he would fall unconscious and might even lose his life.

He went from resisting it to getting used to it, until one day the System suddenly disappeared. Following every clue he could find, he uncovered a little-known story about a girl hidden in the halls of their youthful school. The time he'd once overlooked seemed dim and gray to him, yet it had become the light the girl stubbornly pursued.

Theme: Love and peace