What's the Furthest Episode you Got to Before Finally Dropping A Drama

Sometimes you know your not gonna like a drama early (Queen of Tears, Mr Sunshine) or sometimes a plot development stops you in your tracks (Alice, My Lovely Liar) or a Eureka moment hits and you realise nah I'm not gonna like the way this is going (Start Up Atypical Family) but what's the most you've invested in a show only to finally give up.

I watched May I Help You until like early Ep 15 but then after a scene between ML and his ex gf I just couldn't bear it anymore so I just stopped and didn't bother watching the last 1.5.