This is what I received from them. I am a bit concerned about switching to them.
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WrLife is their master broker behind health insurance. The coverage is provided by Thonburi Hospital Group ASIA (US$500 million in share capital) and behind them is the Boon Vanasin family. The complete handling of the insurance claim is done by AIS Thailand, 24/7 emergency, which is also backed by the Boon Vanasin family.
You take out the health insurance with the master broker WrLife, who also issues the insurance policy and pays your premium: ASSIST INTERNATIONAL SERVICES (THAILAND) CO., LTD. This company will then start your insurance under Thonburi Hospital Group ASIA at the agreed time.