In episode 8 of Return of Superman,  Min gook, one of Song ll Gook's triplets, sings for his dad while on a train ride. His Dad is thrilled.  Not only is it beyond adorable, but little Min gook sings his song in English to boot. 

Here is the video of Min gook singing for his dad:

Can these kids get any cuter?  

Make sure to also catch the first season of Return of Superman so you can see the triplets, Haru and the rest of the children and their affectionate dads.