Both shows are of the same genre - Survival Show and Competition. Iron Squad contestants are fit and determined military reservists. Physical 100 contestants also include military reservists.

Same screenwriter - Shao Hui Ting. Both series are laugh out loud funny with adorable/loveable characters. Bromance is cross-gender-dressing and History is BL. If you liked Bromance, you
will like History!

Both movies are set at the same luxury members only Regal Club. The ML in My Harakuro Boss (MHB) was a supporting character in Overbearing Love (OL). ML from OL has guest role in MHB.