Light here refers to the meaning of love, which is what we commonly call "good people". Such people are kind and warm-hearted to everyone. For example, when they see that someone else's water pipe is broken, they will take the initiative to help repair it. When they see a stranger in need of help, they will not hesitate to lend a helping hand and set up a very good image in the company, just like "Laojin" in the TV series "My First Half Life", which is praised by everyone. He is warm and generous, but such a person is not suitable for life because most of his thoughts are spent on others. Such people say that "central air conditioning" can warm everyone, only suitable for being friends, not lovers.
Love can be divided into big love and small love. Little love can't be shared with others. I just want this light to belong to me. Everyone is possessive and hopes that the other person's love for him is single-minded.