Three months ago, in dramatic fashion, the Malaysia Super League champions claimed a stunning last-gasp 2-1 win over Ulsan Hyundai in their final group stage tie to secure a maiden knockout round appearance in Asia's premier club competition.
At the expense of the defeated 2020 champions and Japanese giants Kawasaki Frontale no less.
Next up for the Southern Tigers are two-time ACL winners Urawa Red Diamonds and, while they will head into the Round of 16 clash at Saitama Stadium 2002 with no shortage of belief, they will be without a key component of their history-making ways.
In what was a shocking development at the end of last month, JDT announced they had agreed to coach Benjamin Mora's request to leave the club due to personal reasons, after a glorious reign that saw him lead the club to four MSL titles, as well as a Malaysia Cup triumph in 2019.
It was not long before former Venezuela international Hector Bidoglio was named as Mora's successor, and he has thus far enjoyed a fine start at the helm with three straight wins for 13 goals scored and just three conceded.
Nonetheless, JDT are always going to be expected to dominate on the domestic front, especially given they have now won the MSL in the past eight years.
The ACL is a different proposition altogether, and also the one they really want to do well in as they look to rise as genuine powerhouses of Asian football.
The quality JDT boast remains unchanged from Mora's time.
On paper, JDT have every reason to believe they can defeat Urawa even if the J1 League outfit will still head into Friday's tie as the favourites.
But what best exemplified JDT's Benjamin Mora era was sheer belief and a never-say-die attitude, perhaps even more so than the organisation and intent that were embedded in their play.
Their first win over Ulsan back in the group stage saw them stun the K League 1 giants with an 80th-minute winner by Bergson.
Their final Group I clash -- against the same opposition -- produced an even crazier spectacle, as they were staring elimination in the face but refused to be denied, hammering the ball into the box again and again until they forced Park Yong-woo into scoring an iconic an own goal as there will ever be.
One only has to look back at the delirious scenes of celebration down the touchline between the JDT players and Mora to know how much he meant to them.
It will now be down to Bidoglio to continue an already remarkable journey.
And more so than what he brings to JDT tactically as a coach, it is perhaps how much he inspires his charges as a person that will determine if the Southern Tigers will be marching on in ACL 2022.