It's about the unbreakable bond, sisterhood/brotherhood, love, and interconnected destinies/fates of those who love each other no matter what. I got teary eyes when I first listened to it.
I GOT YOU is a song about the relationship of the members. >we can see MINA and JEONGYEON peeking thru the window worried but when they see the members, they feel comfortable. JEONGYEON in the lighthouse deficts how she is the mother of TWICE. >the stormy seas outside,but very calm inside the cabin, where the members are. >the red string of fate, the members will always be together.