Walter's care and closeness to Yang Yi were intended to make Yang Yi clearly understand that they were in the same boat, and if one of them leaked any information, the others would be doomed. Therefore, they had to stay united and inseparable.
How to quickly enhance intimacy and foster understanding and friendship? Taking advantage of Yang Yi, and then giving him the most freedom and special care within his professional scope, were all part of the strategy.
Yang Yi understood Walter's intentions and had clearly expressed his and Walter's predicament.
However, Walter's approach was clearly not limited to this. Although he had two ex-wives and four children to support, given his position and income, did he really need to actively take advantage of Yang Yi?
Obviously, he did not.