The original meaning of the senior brothers was this

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"The treatment of similar diseases in two departments creates a strong competitive relationship. Just like in Ward Five where I work and Senior Yoo's Ward Six of the Department of Internal Medicine, both focusing on gastroenterology. I interned in Ward Six, and after that, I was assigned to Ward Five, turning Senior Yoo and me into Romeo and Juliet. We can't be too intimate in conversation when we meet, or our colleagues would suspect us of leaking department secrets. In the hospital, every time there's competition for funding, bonuses, or awards for excellence, our two departments go head-to-head," Kang Huizhu said.

Similarly, the competition between General Surgery Department One and Department Two is fierce.