Tā yídàn zuān jìn niújiǎojiān, jiù tīng bú jìn biérén de huà.
Once he burrows into a dead-end problem, he won't listen to anyone.
Tips
usage
Almost always appears with the verb 钻 in the set phrase 钻牛角尖 — to burrow into the tip of an ox's horn, i.e. to obsess over a problem you can't solve and shouldn't be wrestling with in the first place.
