Formal:
* 저도 보고 싶어요. (Jeodo bogo sipeo-yo.) - This is the most formal way to say it and is suitable for use with someone older or in a professional setting.
Informal:
* 나도 보고 싶어. (Nado bogo sipeo.) - This is a more casual and friendly way to say it, suitable for friends and family.
* 나도 보고 싶었어. (Nado bogo sipeotseo.) - This means "I missed you too" and is used to express that you missed the other person while they were gone.
Informal and playful:
* 나도! (Nado!) - This is a very casual and playful way to say it, simply meaning "Me too!" and is often used with close friends.
Remember to choose the appropriate level of formality based on your relationship with the person you are talking to.