As a fan of parallel universe/time travel plot (tho it may end fictionally in most Cdramaland) I'm loving this…
There will be somesort of pattern on why they keep travel back and forth to the cruise time to find the truth behind Wuyu's sister death, and actually involved some other people on the cruise death too when they're back to land.
hardly there is any triangle eh??? ML already said she is like his sister. This much wobbly character is a norm…
as of Episode 12 he's still treating her as younger sister. I dont think it is a heavy love triangle. she is still a concern since it is suspected that her and her family dead in the very first timeline due to someone closest to their family.