
"Robbing the cradle" is a colloquial and often disapproving idiom that means to enter into a romantic or sexual relationship with someone significantly younger than oneself. The phrase uses the imagery of stealing a baby from its cradle to suggest that the older person is "stealing" or unfairly taking advantage of someone very young. - google

I meant legal ages ofc. Like how a hoobae is manipulating his sunbae’s feeling to change their feelings. I don’t remember any sunbae manipulating a hoobae’s feelings so I meant adult ages not any form of children or minor ages. But as I type this, I remember one story of a sunbae pursuin his hoobae now.
The amount of cradle robbers in yaoi is like genuinely crazy, how does this keep happening