사실대로 말하면... 솔찍히 말씀드리면 (more respectful)

No need to sorry, you are very helpful. Tks so much!

Oh I'm sorry and your welcome.

tks so much, Bryan. I got it already

(To tell the truth 진실을 말하려면) (tell the truth 진실을 말) (To tell you the truth 사실대로 말하면) (To tell honestly 솔찍히 말씀드리면) they can depend on situation and context. I would need a situation example since I am unsure how you wish to say this. like are you asking, saying or, telling someone. I hope this helps.