yes, i guess it so. i asked to confirm about it, now i got it already thanks to you. Thank you so much!

Both Popsicles are famous products in Korea. First, "누가바 (nougat+bar)" is a milk ice cream covered with nougat. And its pronounce is similar to "누가봐" which means "who's watching?". And thiefs hate to be watched. Second, "보석바 (jewel+bar)" is an ice cream contains some small colorful Candies like jewel. And thiefs like jewels. Hope you understood. ^^