More on how shitty scumbag the Crown Prince's son is (and a little of ML's role):
There are those 2 political factions. One led by the Crown Prince, the other by Qin Wang (Tianyu's father).
At a certain point, Qin Wang orchestrates a rebellion, but everything is designed to uproot the other party and paint them as the rebels.
First they isolate the other princes, the ML is out doing some fake work & they try to assassinate the Crown Prince & kill the ML when he is trying to get back (because he suspects that the lack of newd from the capital means something's up).
He ends up injured sneaking into MC's courtyard when she was about to bath. That is the moment he confesses his mother's crimes. MC helps him anyway, regardless everything is a plot to destroy her reputation:
That annoying Lin Wenyuan uncle is in charge of raiding her manor & after some hard work she prevents her cortyard fr being searched (Tianyi also helps).
After MC & her pregnant cousin have escaped with help from MC's & Xiao Yan's man (another prince), they end up in a town with a He family. They just happen to rescue an old woman that's coincidentally related to their grandmother (the Marquees old madam), she brings them to her Manor to hide.
However, weird stuff is going on there. MC finds out that there is a young lady with a disfigured face & they want to use MC to lure a potential marriage candidate, making him believe that Ouyang Nuan is that lady.
That's when MC meets the ML again & sees he is disguising as that potential husband. But it takes her some time to connect all the dots. She only knows about the lady's schemme &, in another side plot, one of the manor's young master is pursuing her.
MC endures just for pregnant Lin Yuanxi's sake, meanwhile, Tianyi appears and displays his abusive behavior. It's when he slaps her hard, after she refuses to leave that manor, and he ends up poisoning that young He Gongzi.
His death comes while they are eating and causes such chaos, that the pregnant cousin gets knocked & her labor accidentaly starts way earlier than it's supposed to.
She almost loses her life. That disfigured lady's brother is a doctor and he manages to safe her & the child. However afterwards, MC gets lured into that lady's courtyard & the crazy woman tries to kill her.
The thing is she knows her schemme has been dismanteled, but since her brother told her that it was possible to transplant's someone else's face, she wants to kill Ouyang Nuan to get hers. She thinks that the ML is in love with her beauty.
ML gets on time to save her and again, his speech (and his feelings) clearly show that he is in love with MC because of her personality. However his own schemme also gets exposed and Ouyang Nuan gets super mad when she connects the dots & realizes they've all been played by Yan Prince (Lin Yuanxin's husband), that he used everyone from her Marquees' family, even his other wives as pawns, he let Qin Wang rebel & kill people just so he can catch him red handed later and win the throne with war.
They need that He's manor rice to feed the ML's & other's armies.
ML reflects on how he was also mad when he found out he was being used by the Crown Prince's son... but it doesn't seem the MC will forgive him for liying to her.
By the way, MC is terrified, like any other abused woman would be, by Tianyi. Especially after he kills that He Yusheng Gongzi. She does has feelings for him, but that's just how those psycho bastards act: they win you over but at the same time they oppress you & try to erase anyone that's around you. It is hard for MC to overcome her mixed feelings of fear and love out of displayed affection/fear she has for Tianyi, despite she isn't dumb and knows he is no good for her.