He was asking before using that sword piece that can send demi drake soul out of body confirming "what would u do after leaving this body" baeksa got annoyed since he expects boat ride to be romantic but even in this moment he is still thinking of his step father body and soul to come back baeksa gets angry " do you hate me that much , do u even know he wants to kill you he would love u if hd come back, i also deserved to get flowers i also deserved to get loved by you" and then he fall into the river by mistake ~i didn't read wrong I used google translation and that's all i got from it.
Again, what you got from Google Translator in general is okay but Muyeon didn’t want to kill him. That’s why he even jumped for Baeksa to safe him. Muyeon is simply in denial of his feelings. It takes a bit more of just Google Translator to actually understand the story that’s why your OP doesn’t make sense.
You don't understand why would he take pieces of sword from that new twink he gave him and accepted the piece of sword you are not getting what i m trying to say here, yeon been nothing to baeksa but jerk since day one "i want my step father i lust after him he called father father in earlier chapters" even later when baeksa try to confront things he brush off like it's beyond his understanding since baeksa is not even humans he is reading novels to understand human emotions baeksa give him dragon orc to keep him alive but he doesn't treat him kind but when others do he doesn't like ... Yah i know he is in denial it's more likely it's his father's body he wants to keep not the person in who is putting efforts to understand him. You are not understanding anything at all
Yeon is clearly confuse I get it but that whole boat scene if u read it u will understand why I m saying it , his actions conflicted towards eliminating baeksa and bringing back his father , or in either way baeksa will be free but reading it from the side of baeksa it was sad cuz he anticipated a romantic boat time or to confront Yeon for something feelings but Yeon stick on asking him about getting free from body which made baeksa realised "he hates me hd doesn't want me he wants father who don't want him."
They are one sidely stating only side of Yeon while both characters play role in here , baeksa efforts and falling in love with yeon even more honest that Yeon himself which made me mad in this story a lot lusting after his step father isn't making me fan of Yeon i only read it for baeksa he is entertaining and sassy and strong unlike Yeon who 24/7 hours only thinks of his step father ... He clearly jump into river too only to protect his step father body not baeksa....

so sad seme was going eliminate uke more likely he has a piece of sword that could do that and uke on the other hand wanted to be loved saying "if it were me i wouldn't have thrown youf flowers like he did instead accepted them did I ask for too much ?, i also deserved to get flowers from you and deserved to be loved" desperation of seme to bring back his step father is nothing but a clueless obsession, I feel bad for uke i know he is not human but he is new to these things and trying to accept the way he embraced the flowers on memory step father steped on he picked them and embraced those flowers into his arms. And all seme did was to kill him. (Kinda on periods so reading this in raws made me sad)