Zheng Xidu has liked Jian Yao since he was a child, but that person has always only looked at his S-level brother Zheng Donglin.
All he can do is to keep showing his presence in front of his sweetheart, telling Jian Yao that he is not worthy of his brother at level A, and that only pheromones of the same level can be together.
But suddenly one day he discovered that Jian Yao was also S-level, and among the three people, he was the one who should quit most, Zheng Xidu.
The whole world said that brother and sister-in-law were so well matched, but no one saw Zheng Xidu. He loved him so humbly, but one day he didn't want to be humble anymore...
Small settings: Pheromones are divided into levels. Generally, only people of the same level can be together.
Intention: love is love