Once Ha Joon made it back to the main capital with his subjects and had presented the 40 billion eres to Artoria… he met with someone who he hadn't seen in a long time.
Gwenevere, the personal maid of Lady Morgana.
Moments before he was about to enter his chamber, she called him to the side to tell him something she had overheard, although Ha Joon didn't take to her at first, the look on her face seemed serious..
"The knights are trying to kill you." She says.
It turned out she had overheard Belinda and Lancelot when they were about taking Ha Joon out of the picture when she had been passing by Artoria's office.
But since Ha Joon was out of the capital at the time, she waited for his arrival, before she told him directly.
But of course she didn't do this without any ulterior motive. As soon as she told Ha Joon what she had heard, she went to her knees and requested he make her his personal maid instead of Yukio.