As a result of the rapid advancement of mobile technology, individuals can now communicate and exchange information from anywhere at any time. Users of MIM applications like KakaoTalk, WhatsApp, Facebook Messenger, and others can enrich their text messages by attaching pictures, videos, and other forms of media. Previous research has shown that the use of emoticons and punctuation marks enables people to convey their emotions and feelings in text-based communication. This study aimed to examine how Korean university students use emoticons and punctuation marks when communicating in English through the KakaoTalk MIM application, and to explore the role of these non-verbal elements in text-based MIM communication. The current study employed qualitative methods, including observing messages and conducting interviews to collect data from Korean university participants. The results showed that Korean participants made use of emoticons and punctuation marks provided by the KakaoTalk MIM application to support their English communication. Some positive functions of these features were demonstrated during conversations with their counterparts on the platform. The benefits of employing these features through a MIM application were discussed in terms of their ability to enhance the effectiveness of textbased English interactions.