Implausible

Four minutes in and we've already seen three totally implausible things. Who writes this crap?
When Nam Hae sees Choi Joon Hyuk forcing himself on Go So Ra, and her squirming to avoid him, Nam Hae walks away instead of punching him out? He blames her?
When the pilot turns the vessel, it's enough to throw Go So Ra over the railing after a lifetime on boats and ships?
When she falls into the water, Go So Ra doesn't know how to swim after a lifetime on boats and ships?
Why don't they just start a completely new show if they're going to make up completely new characters?