That was a painful spot to end the episode... I really needed the resolution to this part... But to someone who hasn't read the books this probably isn't nearly so bad...
And really Lakan and Fengxian are both fairly broken people, it's not really surprising they took the paths they did... But both their fates were ruined by the birth of Jinshi and the 'other imperial child' who would go on to pass away. Hence the disgrace of Lakan's uncle and Lakan being sent away to destroy Fengxian's hopes.