想請教下高手們有關韓文的問題

The first answer is incomplete. Since you asked for further answer, I will try to explain it to you.

여보세요 means "hello".
It is similar to "喂~喂~" in Cantonese.
We will say it when picking up the phone.
We will not use it when we meet people or asking for help.
실례지만 means "pardon me/ excuse me/ but"
It is similar to "唔好意思..." in Cantonese.
We will say it when asking for help, when interrupting others or changing topic politely.

여보세요===hello! it is a complete sentece.

실례지만==excuse me,but it is not a complete sentence,,so something is going to say after that!


say,,``````excuse me,,can you help me?

example실례지만,도와 주세요?