וַיֹּ֥אמֶר מֹשֶׁ֖ה כֵּ֣ן דִּבַּ֑רְתָּ לֹא־אֹסִ֥ף ע֖וֹד רְא֥וֹת פָּנֶֽיךָ׃ (פ)
모세가 가로되 왕의 말씀이 옳으니이다 내가 다시는 왕의 얼굴을 보지 아니하리이다
Rashbam
וירדו כל עבדיך, Even at this point Moses respected royalty, and, when referring to something undignified for a king, instead of describing the indignity as being something the king had to endure, described it as something his servants would have to endure. Let us look at the facts reported in the Torah: While the dying was in progress, the Torah reports Pharaoh as rising from his sleep in 12,30-31 calling in Moses and Aaron and doing exactly what Moses had predicted at the time Pharaoh had expelled him from his presence. (10,29)
Rashi
כנים means TRUE MEN — Similar examples of כן in sense of true, right, are (Exodus 10:29) “Thou hast spoken right (כן)”; (Numbers 27:7) “The daughters of Zelophechad speak (כן) right”; (Isaiah 16:6) “and his wrath, his untruthful (לא־כן) boastings”.