I've marathoned all the episodes in the last couple of months. I love watching the 4 brothers together (now 5) where they learn something from every Master. It could be Right Now (life is short, don't wait and just do it), being content & less obsessed with material things (why do I need another pair of trainers when I've got one already), you're never too old to go for your dream (Kim Byung Man & his amazingness) and many many more.

Non-exhaustive favourite episodes:
85&86: where they dance their heart out with J Black & Park Ji Woo
58 & 59: where they made their first MV (we need a new one now by the way) with Yoo See Yoon
44&45: with Kim Soo Mi and the hilarious "are you a good son" telephone battle
17&18: with Park Ji Sung... Never seen them so excited before
14-16: with Papa Park Hang Seo.... Love and birth of the lemon game
100&101: it made me emotional when I saw the recap videos and how far they've all grown.

Thank you for such a great show. JIBSABU FIGHTING!!