According to a report from an insider on December 3, the trio recently filmed their MV for the upcoming release in Hong Kong! Both Eric Nam and Gallant attended the '2016 MAMA' which took place in Hong Kong on December 2 as performers. It makes sense that while they were there, Tablo could simply join them and they could carry out filming.
The song by Eric Nam x Tablo x Gallant will be called "Cave Me In". Stay tuned for more details!