Tā měitiān xué dào língchén sān diǎn, zhēnshì juǎnwáng.
He studies until 3 AM every day - a true grind king.
Tips
culture
卷王 combines 卷 (from 内卷, involution/grinding) with 王 (king). It describes someone who takes hyper-competition to the extreme - the person in your class or office who makes everyone else look lazy. Can be used admiringly or critically.
usage
Often used with mixed feelings - part admiration, part resentment. When someone is a top grinder, others feel pressured to match their intensity.
