The line or panel that your friend shared with you actually made sense and is poetic if you read it along with the other lines/panels.

What's weird was Jooin's last line being "I have no regrets". He definitely had regrets, shown in the prior chapters. And, it is kinda weird that the MC's last line was a negative one (i.e.: I have not). It could have been an optimistic one with a similar premise like "I am happy now", but since it would be related to Cain's wish for Jooin.... they avoided it. But it could be "I love you" or "I like being with you"... anyway