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Chaos concealing the true happiness of "family" is about to be replaced by... a billion-baht inheritance!!!

The 65th birthday party of Than Phuying Unruean Rattanawongwan (Duangta Tungkamanee) is held with great honor. Her five children, all famous figures in high society, bring their families together for a full reunion. However, this is the only day Than Phuying feels truly happy and warmed by the presence of her children and grandchildren.

Eventually, Than Phuying can no longer endure her loneliness. She devises a brilliant plan to tie her children down: the "One Year, Get Rich Quick" project. Badin (Auan-Rangsit Sirananon), her adopted son who has just graduated from abroad and returned to take care of her out of gratitude, helps send this plan via email to all her children.

The rules are simple: Each family must send one grandchild to live in the main Rattanawongwan house for one full year. If a grandchild succeeds, they will receive Than Phuying Unruean’s billion-baht inheritance!!! But there is a catch: only one person can win.

Chaos erupts immediately. Every family rushes to send a grandchild to the Rattanawongwan mansion.

• Lemon (Poppy-Boonyisa Chantrarachai): The beautiful, talented, and confident granddaughter. Troubled by her father's remarriage, she voluntarily chooses to come live with her grandmother.
• Ek (Ben AF7), Nong On (Orn-Patteera), and Pok (Richard Ghiani): These grandchildren are forced by their families to join the project against their will.
• Ead (Mean AF7): Than Phuying’s daughter and the only one who is still single. Clever and afraid of being at a disadvantage, she asks to join the project herself to secure the rights for her future children.

Fun and chaos ensue daily, fueled by the mischievous nature of the grandchildren. How will Than Phuying handle them? Who will be the heir to win the billion-baht inheritance?

Follow the excitement in the drama "Operation Billionaire" (Pan Lan Panan Rak). Airing every Monday - Tuesday at 8:15 PM on True4U. First episode aired on Monday, January 26, 2015.