Hi, sooooo for some elaboration;
the name and recurring phrase within the song 星辰大海 literally means 'the stars and the sea/ ocean' and is actually an Internet phrase that means we have lofty goals. The 'stars' represent the distant and unknown, and the 'sea/ ocean' represent the incomparable and boundless.

Song: Xing Chen Da Hai 星辰大海 Stars and Sea
Singer: 黄霄云 Huang Xiaoyun

Please check out my other channel Tempest & Me where I plan to make mostly historical/ cultural videos with a dash of randomness :)
Other channel:    / @tempestme-ob3ml