The thorns on the outside of the cactus are not only to protect the body from harm, but also to protect one's fragile and persistent heart from harm. Although, while protecting yourself, you will also hurt the people who love you.
This is a story about secret love.
The heroine Su An in the story fell in love with a senior who was one grade above her in her freshman year of high school, but she missed it because of a series of coincidences. During this lengthy secret love, Su An finally met her senior again five years later. However, they are no longer what they used to be. But that senior student finally understood that the emotion he had been ignorant of back then was called love.
Just——
You and I met, but we can never go back to the beginning.
This time, I choose to be brave: I love you, but it has nothing to do with love anymore.