For the first time, Cheon-il uses his tracksuit for its intended purpose- as workout clothes, in anticipation of the big company athletic competition which he ends up taking far, far too aggressively. I was a little disappointed that Cheon-il's training montage is just general athletics. It would have made for a much funnier overall joke if Cheon-il had been taking mixed martial arts lessons and his performance on the field was a result of his mis-applying those skills in the wrong context.
Elsewhere, Ik-hee starts taking private tutoring lessons on the behest of her mother, which predictably backfires since Ik-hee made very clear her desire to continue going to a private classroom rather than take prviate lessons. This story was noteworthy to me mainly because the tutor is played by Park Jin-joo, an actress I rather like even though she has trouble getting anything better than third tier roles. Still, Ik-hee's rude albeit reasonable question about employment prospects was fairly funny.