我只能是你的男主角我只能是你的女主角
[wŏ zhĭ néng shì nĭ de nán zhŭ jiăo wŏ zhĭ néng shì nĭ de nǚ zhŭ jiăo]
This expresses the sentiment that in love and life experiences, they are only destined to be partners in someone's story, highlighting a strong commitment or belief in their role as each other's significant other. It conveys a sense of uniqueness and destiny in their relationship.