Combination is a mathematical term. Generally speaking, any m (m ≤ n) elements are selected as a group from n different elements, which is called a combination of m elements from n different elements. At that age when we were together based only on the love in our hearts, C42 was just choosing two of the four people to be together, and we got six completely different yet tightly bound youthful emotions, which ran through the protagonists' high school, college and beyond, and became their deepest memories of their youth.
Intention: The biggest mistake in life is to miss it. If youth is never missed, then there is no fault.
