Heroine

Because her not telling Ceaser does still places him in risk and as we saw she does love... plus the whole trust thing which she would have lost with him and the guilt that she probably felt.
She made the right choice in my opinion.

I agree with you

The hell are you saying?

i agree so much but i also agree she wanted to not hide anything from the prince. Plus it would be harder for the prince not to feel salty if she revealed the plot to him after he drank the poisoned wine

No even if hezs immune to poison it will still hurt him

yeah i know

Trust... Even Cesar knew what to do, drink the bloody poison. The right choice would be dont tell (you never know who is watching and listening). After the event, she could explain to him what happened, and that she knew he wouldnt die. She can help him much more if she is double agent than having his "trust". If you want the throne you need to be smart (hellow GOT)

Yeah i feel like the artist/writer just didnt want risk her becoming a not perfect protag in people's eyes

Yupe.

So she should stay quiet and endanger Cesar? As she mentioned herself, this is a powerful poison and while it probably won't not kill him it will leave him in a very weakened state and he could be attacked at any moment.
Note that not telling him only directly benefits her in this case, as it would keep her in the good graces of the empress, but nothing implies that it would be best for Cesar.
Hell, Cesar could also just marry Grace and be done with it if he really cared for the position of emperor (which he doesn't).
And how do you think Cesar would have felt after drinking that poison and having his wife, which he actually trusts, telling him that she knew about it, but decided not to tell him ?
What Canaria did was a very basic thing for humans. She protected someone she loves even if it came with a cost.

Yupe, she should. It's very political decision. We can never know because the author can do whatever he want, but if I were Cesar I would understand and agree if she didnt tell. By telling him: 1) we never know who could listening 2) He could make a poor action when drinking and they could know he is faking. So the point of drinking the poison would be meanless.
Well thats just me thinking. I would make the heroine much more smart (especially cause she is way older). She is very weak in the castle (political speaking), if she gain one more enemy that would only put her in a more fragile situation. (Cause the emperor dont like her etc).
I get this is a romance and bla bla bla, but I still want to read a real story.

I disagree with you. The mc did the right choice by telling him the truth. And you said that if you were to be put in Cesar shoes well, you would understand why she didnt tell him beforehand ? Oh please, its easier than done honey. Trust me you wouldnt be saying this if it really did happen to you. Cesar would have felt really betrayed if Canaria really did like you suggest. Plus if you really love someone, you wouldnt even dare risk putting the person you love in danger tho you know its not really fatal. What Canaria did just shows how sincere her love is for Cesar and it also shows how humane she can be. It would be boring and sad for me to read if the author really decided to potray Canaria as someone who is selfish and cowardly just cuz she was afraid of the empress finding out that she switches side because love comes with selflessness. For me, the author did a really great job in potraying Canaria to the reader as someone who is selfless.

Lol, I give up. It's very clear for me, so it's kind of frustrating to explain over and over. It's not "afraid and coward" act, but tactical and planned. The story changed so you never know what the enemy is ploting and even when you do, you can always gain to know your enemy moves. Well, you can say it was the MORAL right decision. But in her position, as future queen, she cant always choose the moral way (well maybe she can, it's a fantasy webtoon anyways lol ┑(￣Д ￣)┍).

I find it very hard to believe that Ceasr wouldn't have been deeply hurt by her actions.
We clearly saw how much he cares for her and the trust he feels he has with her.
You keep on talking about making the correct political choices ect, but you do realize you need allies you can count on right? i.e people that you can trust and that they can trust you.
It's kinda funny that you think putting someone at risk without giving them a choice is "tactical and planned". If Ceasr would have agreed to do it then it's an entirely different matter, but lying for your own gain...
From a practical point of view, Canaria's actions just further enhanced the trust Ceasr (the future emperor) has in her and in the grand scheme of things it would be better for her, as the emperor is the one with the actual power.
It should be noted that the empress is going to become her enemy in one point no matter what, so it would be better to solidify her position with party she sided with. Like it or not having the trust of the people who follow her husband is as important as other allies as it means she has better support structure to work with.